#include <XFbase.h>
void output_as_input()
{
	Worksheet wks = Project.ActiveLayer();
	if(!wks)
		return;
	
	Column col = wks.Columns(0);  // first column in worksheet
	
	// X-Function: spline
	string strXF1 = "spline";
	XFBase xf1(strXF1);
	
	vector vData(col);
	xf1.SetArg("ix", vData);  // set input: ix
	
	vector vOutput;
	vOutput.SetSize(vData.GetSize());
	xf1.SetArg("ox", vOutput);  // set output: ox
	
	DataRange dr;
	dr.Add("X", wks, 0, 1, -1, 1);  // second column in worksheet
	dr.Add("Y", wks, 0, 2, -1, 2);  // third column in worksheet
	xf1.SetArg("iy", dr);  // set argument iy
	
	// execute X-Function spline
	xf1.Evaluate();	
	
	// X-Function: stats
	string strXF2 = "stats";
	XFBase xf2(strXF2);
	
	// set input: ix, with the output of X-Function spline
	xf2.SetArg("ix", vOutput);
	
	// output of X-Function stats
	double dMean;
	double dMin;
	double dMax;
	double dSum;
	xf2.SetArg("mean", dMean);
	xf2.SetArg("min", dMin);
	xf2.SetArg("max", dMax);
	xf2.SetArg("sum", dSum);
	
	// execute X-Function stats
	xf2.Evaluate();
	
	// print result of X-Function stats
	printf("Statistics Results:\nMean=%f\nMin=%f\nMax=%f\nSum=%f\n", dMean, dMin, dMax, dSum);
}